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Finding the Fourth Proportional to 20,078.70, 27,706.17 and 11,124.90

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Solution

The fourth proportional to 20,078.70, 27,706.17 and 11,124.90 is: 15,351.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,078.70 : 27,706.17 = 11,124.90 : x
  2. Step 2: Convert to fraction form
    20,078.70/27,706.17 = 11,124.90/x
  3. Step 3: Cross multiply
    20,078.70x = 27,706.17 × 11,124.90
  4. Step 4: Simplify right side
    20,078.70x = 308,228,370.63
  5. Step 5: Solve for x
    x = 308,228,370.63/20,078.70
  6. Step 6: Final answer
    x = 15,351.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.